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Try looking at the website DESIGN MY NIGHT, it’s great to filter locations, cuisine, event style etc and you can book everything through that website.. I used to use it for inspo when I was a location manager but now use it when family is in town. https://www.designmynight.com/london?gad_source=1&gclid=CjwKCAiA2cu9BhBhEiwAft6IxGygljBUdM6qg0e2bFsEvClJgXDQrZL6p75O_TDEZRjz-ALBF7WcfBoCvjQQAvD_BwE
I used Tollgate Community Hall in Kilburn - they also offer a soft play too if you have little ones!
Hullabaloo at The Sherriff Centre could be an option as kids play adult can chat and chill. Depending on budget, Westminster club rooms/halls have great hire rates and you can bring decorations and catering. ?Alternatively you can order in) https://community-hall-booking.westminster.gov.uk/Rooms/Index Check local schools in your area as most you can hire the school hall, playground or smaller classrooms.
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